Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm

Question

Quizplus · Accepted Answer

The transverse tubules of muscle fibers are invaginations of the plasma membrane that allow impulses to rapidly penetrate the interior of the muscle fiber. These impulses stimulate the sarcoplasmic reticulum, a specialized membranous structure within the muscle fiber, to release stored calcium ions into the cytoplasm. This calcium release triggers the sliding of actin and myosin filaments, leading to contraction of the muscle. Therefore, choice A is the best answer.

Impulses Conducted Along the Muscle Fiber's Transverse Tubules Stimulate the Release